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start or hung start).
The EEC sends a no dispatch signal to the DEUs for these FMV
failures:
* FMV is not in the correct position
* FMV position signal is out of range on both EEC channels
* FMV position signal is out of range and EEC in single
channel operation
* Control current to the FMV EHSV is out of range and EEC in
single channel operation.
ENGINE FUEL AND CONTROL - ENGINE CONTROL - HMU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-21-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-016
The DEUs energize the ENGINE CONTROL light on the P5 aft
overhead panel and the MASTER CAUTION lights when these
conditions occur:
* Airplane is on the ground more than 30 seconds after
landing or increasing ground speed is less than 80 knots
* EEC is energized (engine starting, running, or EEC
energized for maintenance)
* A no dispatch engine fault occurs.
Transient Bleed Valve (TBV)
The TBV EHSV controls the flow of servo fuel pressure to the
TBV. A switch supplies TBV position feedback to the EEC.
The EEC sends a no dispatch signal to the DEUs for these
failures:
* TBV is not in the correct position
* TBV position signal is out of range on both EEC channels
* TBV position signal is out of range and EEC in single channel
operation
* Control current to the TBV EHSV is out of range and EEC in
single channel operation.
See the transient bleed section for more information.
(SECTION 75-23)
HPTACC and LPTACC
The HPTACC and LPTACC EHSVs control the servo fuel
pressure for the HPTACC and LPTACC valve operation.
LVDTs on these valves send valve position to the EEC.
The EEC sends a no dispatch signal to the DEUs for these
failures:
* HPTACC is not in the correct position
* HPTACC position signal is out of range on both EEC
channels
* HPTACC position signal is out of range and EEC in single
channel operation
* Control current to the HPTACC EHSV is out of range and EEC
in single channel operation.
NOTE: LPTACC failures do not cause the ENGINE CONTROL
and MASTER CAUTION lights to come on.
See the HPTACC section for more information.
(SECTION 75-21)
VBV And VSV Actuators
The VBV and VSV EHSVs control the servo fuel pressure for the
VBV and VSV actuator operation. LVDTs on these actuators
send valve position to the EEC.
The EEC sends a no dispatch signal to the DEUs for these
failures:
ENGINE FUEL AND CONTROL - ENGINE CONTROL - HMU - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 73-21-00
Page 46
D633A101-GUN Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
CFM56 ENGINES (CFM56-7) 737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
73-21-00-016
* VBV or VSV is not in the correct position
* VBV or VSV position signal is out of range on both EEC
channels
* VBV or VSV position signal is out of range and EEC in single
channel operation
* Control current to the VBV or VSV EHSV is out of range and
EEC in single channel operation.
See the variable stator vane actuation system section for more
information. (SECTION 75-31)
See the variable bleed valve doors section for more
information. (SECTION 75-32)
GUN ALL PRE SB CFM56-7B 73-44
Burner Staging Valve Solenoid
The EEC operates the burner staging valve (BSV) solenoid to
the control the flow of servo fuel pressure to the BSV. The EEC
monitors the BSV position.
The EEC sends a no dispatch signal to the DEUs for these
failures:
* BSV failed in the closed position
* Control current to the BSV solenoid out of range and EEC in
single channel operation.
For more information on the BSV, see BSV in this chapter.
GUN ALL
High Pressure Fuel Shutoff Valve (HPSOV)
The high pressure shutoff valve (HPSOV) lets fuel flow from the
FMV to the fuel nozzles.
The start lever sends an open signal to the DEUs when it is in
the idle position. The DEU sends the open signal to the EEC.
The EEC causes the FMV to open. Fuel pressure from the open
FMV causes the HPSOV to open.
The start lever in the CUTOFF position energizes the HPSOV
solenoid. When HPSOV solenoid is energized, servo fuel closes
the HPSOV. Fuel pressure from the FMV can not open the
HPSOV when the HPSOV solenoid is energized. The fire handle
switch can also energize the HPSOV solenoid.
When the HPSOV closes, fuel flow to the fuel nozzles stop.
The blue ENGINE VALVE CLOSED light, on the fuel control
　
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